Zalman 9700 or ARCTIC COOLING Freezer 7 for light overclock

I have a core 2 duo e6600 that i plan to overclock some by raising the fsb to hopefully 333mhz. I know the zalman 9700 is a lot better, but its also a lot more expensive. Considering that the case has excellent ventilation (thermaltake armor w/ 25cm side fan) will the freezer 7 be sufficient?

Remember most of those heatsink tests you read will have been performed outside a case or inside a case with a side off. If you really want to overclock and have cooler temps then I'd go for the Zalman and damn the cost.